Jesus has been speaking about the end of the world and His return in glory. Now, He gives his disciples a critical warning.

"But of that day and hour no one knows, not even the angels in heaven, nor the Son, but only the Father. Take heed, watch and pray; for you do not know when the time is. It is like a man going to a far country, who left his house and gave authority to his servants, and to each his work, and commanded the doorkeeper to watch." - Mark 13:32-34 (NKJV)